<template>
  <view>
    <view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length!==0">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="right" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash-filled" size="17" @click="clean"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer:null,
        kw:'',
        // 搜索的结果列表
        searchResults:[],
        // 搜索历史的数组
        historyList:[]
      };
    },
    onLoad(){
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods:{
      // input输入事件的处理函数
      input(e){
        // console.log(e)
        clearTimeout(this.timer)
        this.timer = setTimeout(()=>{
          // console.log(e)
          this.kw = e
          this.getSearchList()
        },500)
      },
      async getSearchList(){
        // 判断搜索关键词是否为空
        if(this.kw.length === 0){
          this.searchResults = []
          return 
        }
        const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
        if(res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        this.saveSearchHistory()
      },
     
      gotoDetail(item){
        console.log(item.goods_id)
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      // 保存搜索历史记录
      saveSearchHistory(){
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        // console.log(set)
        this.historyList = Array.from(set)
        // 对搜索历史数据，进行持久化的存储
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      clean(){
        this.historyList = []
        uni.setStorageSync('kw','[]')
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    },
    computed:{
      histories(){
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
  .search-box{
    position:sticky;
    top:0;
    z-index:999;
  }
  .sugg-list{
    padding:0 5px;
    .sugg-item{
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 12px;
      padding:13px 0;
      border-bottom:1px solid #efefef;
      .goods-name{
        // 文字不允许换行(单行文本)
        white-space: nowrap;
        // 溢出部分隐藏
        overflow: hidden;
        // 文本溢出后，使用...代替
        text-overflow:ellipsis;
      }
    }
  }
  .history-box{
    padding:0 5px;
    .history-title{
      display: flex;
      justify-content: space-between;
      height:40px;
      align-items: center;
      font-size: 13px;
      border-bottom:1px solid #efefef;
    }
    .history-list{
      display: flex;
      .uni-tag{
        display:inline-block;
        margin-top:5px;
        margin-right:5px;
      }
    }
  }
</style>
